[wieslawsoltes]

Problem

Unchanged Code OSS uses nested max(..., calc(...)) blur lengths for voice glow rendering. The retained parser stopped at the first nested parenthesis and only accepted literal pixels, so the valid computed filter was omitted.

Change

• scan filter functions using balanced parentheses within the existing 16-function bound
• resolve blur through WebScene's computed calc/min/max and custom-property length pipeline
• admit non-negative absolute, font, viewport, and container lengths while rejecting percentages and unsupported units
• retain the 256 CSS-pixel blur safety bound and compound ordering
• add Code OSS-shaped native retained-radius and browser computed-value coverage

Validation

Tests and builds were deliberately not executed under the current implementation-throughput directive. Browser/native pixels, damage, performance, memory, lifecycle, package, and CI gates remain required before release promotion and are recorded in #489/#256/#235.

Closes #489